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3. By law, chlorofluorocarbons (CFCs) used as refrigerants in refrigerators must be removed before the appliances are discarded. This solves only part of the ozone-depletion and global-warming problem attributed to refrigerators. Why? 26. At one time in parts of Scandinavia and Germany, butchers were prohibited from hanging slaughtered hares and rabbits in their shop windows. Why? 50. Kristine Petterson has written a delightful little book of experiments for children entitled Icky Sticky Foamy Slimy Ooey Gooey Chemistry . One of the more endearing experiments is called “brain sludge,” and it involves mixing milk with a chemical to form “quivering white globs of goo.” What is the chemical, what is going on? 93. All books that deal with the history of chemistry refer to the philosopher's stone. What was it made of?
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